857221447 has 8 divisors (see below), whose sum is σ = 907902000. Its totient is φ = 806569344.

The previous prime is 857221369. The next prime is 857221451. The reversal of 857221447 is 744122758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 857221447 - 2¹¹ = 857219399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857221457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113629 + ... + 120937.

It is an arithmetic number, because the mean of its divisors is an integer number (113487750).

Almost surely, 2^857221447 is an apocalyptic number.

857221447 is a deficient number, since it is larger than the sum of its proper divisors (50680553).

857221447 is a wasteful number, since it uses less digits than its factorization.

857221447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14225.

The product of its digits is 125440, while the sum is 40.

The square root of 857221447 is about 29278.3443350200. The cubic root of 857221447 is about 949.9432826712.

The spelling of 857221447 in words is "eight hundred fifty-seven million, two hundred twenty-one thousand, four hundred forty-seven".